Texas Attorney General Ken Paxton, a Republican, poses at a rally for his Senate bid at Southern Roots Brewing Co. on Oct. 17, 2026, in Killeen, Texas. —Joel Angel Juarez—Getty ImagesPolitical advertising spending for the midterm election cycle this year has reached a record high, surpassing $10 billion as of last week. It is projected to reach $11.6 billion by Election Day, according to the media tracking group AdImpact. The previous midterm spending record was set in 2022 at $8.9 billion, the organization reported, and the 2024 presidential cycle saw some $11.2 billion spent on ads. The figure does not capture other campaign expenses, such as staffing, travel, and voter outreach. But it does measure one of the more influential political campaign tools: Research published in the American Political Science Review in 2021 estimated that a Senate candidate with a $2 million television advertising advantage over an opponent could gain about 10,000 votes—potentially enough to tip a close race.Read More: Ohio May Be the Sleeper Senate Race of the MidtermsSpending the most, however, does not guarantee electoral success, experts tell TIME.“It is important to keep in mind that having the most, and spending the most, does not guarantee you wins,” says Brendan Glavin, the director of insights at the research group OpenSecrets, which tracks money’s effect on U.S. politics, policy, and elections. “You need to have enough to compete, and you need to be able to get your name out, and people need to know who you are. But it’s not always about having the most.”That has not deterred both parties from digging deep into their piggy banks this cycle—although their spending has been uneven.Republicans have significantly outspent Democrats in Senate races, at $233 million to $121 million on broadcast television ads across nine of the tightest upper-chamber races last month, according to AdImpact. In races categorized as “toss-ups” by the Cook Political Report, AdImpact data attributes $947 million to Republicans and $625 million to Democrats, including ads that have not yet been aired. A large portion of the funding comes from a small number of deep-pocketed individuals bankrolling super PACs.The spending gap is much narrower in House races, where Republicans have outspent Democrats by $14 million across 21 toss-up races. Democratic Senate candidates, however, have substantially outraised their Republican opponents in many competitive races.Here’s where some of that money has come from and a look at how it’s being spent.Texas Senate race: $500 millionTexas is one of the most closely watched Senate races. October polling shows that James Talarico has the chance to become the state’s first Democratic Senator since 1993. A win in the state would deal a critical blow to Republicans’ grip on the upper chamber of Congress. He’s at 51% against Republican Ken Paxton according to CBS/YouGov polling from Oct. 8-16.Combined ad spending and airtime reservations have surpassed $500 million, according to AdImpact, making it only the second non-presidential race to cross that threshold. The Ohio Senate race in 2024 reached $542.7 million. Elon Musk, who has given $369 million to Republicans since the start of 2025 and is the biggest individual donor to federal elections this cycle, gave $158 million last month to Senate Leadership Fund, which transferred matching amounts to Texas PAC, the group supporting Paxton. Musk gave an additional $10 million to Lone Star Liberty PAC in August to support the candidate.Glavin says that these donations, although not funneled to Paxton’s campaign directly, “essentially went directly into supporting Paxton” and appear to have “helped stabilize things” for him.Talarico has outraised his opponent by roughly $50 million from July through September—but large donors and super PACs have given Paxton the edge when it comes to broadcast ads. Ohio Senate race: $460 millionOver $450 million in combined ad spending has gone toward Ohio’s Senate race, according to AdImpact.Republicans have spent nearly $270 million to support Jon Husted, while Democrats have spent over $180 million in support of Sherrod Brown. Ohio gives Democrats another chance to flip a Republican-held seat, with Husted leading by less than a point as of Sunday, according to an ActiVote poll.Husted was appointed to replace Vice President JD Vance in 2025, meaning that the winner of this special election would need to win again in 2028 to serve a full six-year term.Through September, Republicans spent $41 million more than Democrats in aired election ads, making it the second-largest GOP dollar advantage among nine identified battleground states, behind Texas, according to AdImpact.Maine Senate race: $200 millionMaine is home to the most expensive Senate race per capita this cycle, with a combined ad spend of roughly $200 million.In Maine, Democrats are vying to flip a red seat. Republican Sen. Susan Collins is seeking her sixth term, but she’s closely contested by logger and former Maine Senate President Troy Jackson. Republicans have spent or committed almost $114 million on advertising since January, compared with almost $81 million for Democrats, according to AdImpact.What are the donation limits for PACs and super PACs? The Federal Election Campaign Act sets limits for individual donations to congressional races.The limit for an individual donation to a candidate’s campaign is $3,500 per election for the 2025-2026 election cycle. These caps are adjusted for inflation every two years. A traditional political action committee (PAC) pools contributions to support or oppose candidates. Individuals may contribute up to $5,000 to a traditional federal PAC per year. The limit is higher for contributions to a national party committee, at $44,300 per committee per calendar year. Super PACs, unlike traditional PACs, cannot donate directly to candidates’ campaigns or coordinate their advertising with those campaigns. Those restrictions are intended to prevent unlimited outside donations from becoming a way around limits on contributions to candidates.There is no limit to how much an eligible person or entity can donate to a super PAC, as demonstrated by Musk's steep contributions in Texas. Several other billionaires have also contributed to Republican super PACs: Shipping industry moguls Elizabeth and Richard Uihlein donated $138 million in the current election cycle, while Jeff Yass, who founded Susquehanna International Group, and his wife, Janine, contributed $110 million. The top donor to a Democratic super PAC is George Soros, who is linked to the entities responsible for contributing $102 million to Democracy PAC, which he founded in 2019.Two court decisions in 2010 helped establish today’s super PAC system. The Supreme Court’s Citizens United ruling protected independent political spending by corporations and unions, while a subsequent federal appeals court ruling removed limits on individual contributions to groups making only independent expenditures.Critics argue that the system gives wealthy donors disproportionate political influence and allows money to flow through nonprofits that conceal its original sources, using what’s referred to as “dark money.” Super PACs must disclose their donors, but those donors can include organizations that do not identify their own funders. The legal rationale for allowing unlimited contributions rests on the premise that prohibiting individuals or entities from contributing directly to campaigns prevents corruption.