Hillary Clinton’s campaign is pushing new money and top surrogates into Arizona in an effort to win the reliably red state, but Republicans are confident that Donald Trump’s struggles there won’t sink incumbent GOP Sen. John McCain’s re-election.

The Clinton campaign, hoping to expand the electoral map as her poll lead over Donald Trump increases nationally, announced a $2 million investment in Arizona earlier this week. Bernie Sanders, Chelsea Clinton and Michelle Obama have stumped there in the days since to gin up excitement in a state now considered a 2016 battleground.

But even as the RealClearPolitics polling average shows Clinton with a slight lead over Trump in Arizona, McCain has a sizable advantage over his challenger, Democratic Rep. Ann Kirkpatrick, according to the RCP average, though some recent surveys show a tighter race.

Still, McCain, the five-term senator and former GOP presidential nominee, described 2016 as the race of his life several months ago, and his party’s standard-bearer hasn’t made things easy on him. Democrats hope Trump’s struggles and Clinton’s new investment could help lift Kirkpatrick in the final weeks of the campaign.

Kirkpatrick appeared with Chelsea Clinton at a rally at Arizona State University Wednesday but didn’t campaign with Sanders during his two stops in the state. Kirkpatrick also appeared at a rally Thursday in Phoenix with first lady Michelle Obama (who referred to her as “Ann Patrick” when giving a shout-out to the Senate candidate). The first lady’s campaigning has been limited this cycle, but she has drawn large and enthusiastic crowds.

Kirkpatrick used the two visits this week to make her pitch to a wider group of voters who may not have paid close attention to the Senate race until now.

“I have flipped two congressional districts from red to blue and this time, we’re going to flip the entire state from red to blue,” she said at the rally with Clinton’s daughter. “Together we can make history in November. We can elect the first woman president of the United States. And we can make history in Arizona and elect the first woman senator."

Kirkpatrick has sought repeatedly this election to tie McCain directly to Trump, who garnered only 37 percentage points in an Arizona Republic poll this week. McCain stood by Trump after he won the nomination, and Kirkpatrick was one of the first Senate candidates to link her opponent to Trump in an ad months ago. McCain withdrew his endorsement of the GOP nominee after the video surfaced of Trump talking about making unwanted sexual advances and several women accused him of sexual assault. Nonetheless, earlier this week Kirkpatrick’s campaign released an ad saying McCain endorsed Trump 60 times, arguing he pulled his endorsement for political expediency.

Despite Trump’s struggles and Democrats’ efforts to tie his fate to McCain’s, Republicans are confident McCain can hold his own in the Senate race. They argue he’s a known quantity in Arizona and thus able to separate himself in voters’ minds and avoid any major drag from Trump. The same poll that showed Clinton leading Trump by 5 percentage points showed McCain above 51 percent and topping Kirkpatrick by double digits.

McCain received a higher percentage of Republican support than Kirkpatrick did backing from Democrats, and the GOP senator led his challenger by double digits among independents.

Chuck Coughlin, a former McCain aide and GOP strategist in Arizona, said McCain’s deep roots in the state inoculated him from Trump, and his decision to withdraw his support actually improved McCain’s standing with voters.

“It’s not like Arizona is turning blue, culturally blue,” Coughlin said. “We’re still a red state. It’s that Trump’s imploding. The party is having an identity crisis, which I think has actually helped John because he can define for himself what it means to be a conservative instead of reacting to the alt-right anger all the time."

Christian Ferry, co-founder of Arizona Grassroots Action, a super PAC supporting McCain, said voters see the presidential race and Senate race through different lenses and pointed out that while Clinton’s campaign has invested there, the Democratic Senatorial Campaign Committee and Democratic super PACs invested in winning the Senate majority had not moved money to the state. He also said his group had focused for months on early voting, where he thought McCain would have an edge, while Democrats’ investments were coming late in the cycle.

Republicans also pointed out that top-of-the-ticket struggles go both ways. Despite her lead, Clinton’s unfavorability in the Arizona Republic poll was 56 percent, and Republicans highlighted an interview on CNN earlier this week in which Kirkpatrick said “I do” when asked if she finds Clinton trustworthy.

Democrats, however, smell blood. They think linking McCain to Trump can peel off moderate voters turned off by the controversial GOP nominee, and that hard-core Trump supporters will flee McCain come Election Day for not standing with their presidential candidate. They point to a Washington Post poll released this week that showed McCain with only a three-point edge.

Andy Barr, a Democratic strategist in the state, said there was “no reason to believe” that McCain could top 50 percent of the vote with Trump hovering in the high 30s.

“I would say we’re seeing some movement on the Senate race,” Barr said. “It hasn’t moved as much as the presidential [race] in Arizona. Trump’s not up in any public polling in the state and Kirkpatrick’s kind of closing fast."

D.B. Mitchell, a spokesman for Kirkpatrick, said the state was “on the verge of something historic” and predicted that Clinton’s investment would be a boon to Kirkpatrick.

“What you’re seeing with so much national attention coming to Arizona is folks are excited,” Mitchell said. “People are going to make some historic choices on this Election Day, and they’re going to elect our first woman senator from Arizona and going to be ready to take on new, principled leadership because they’re tired of John McCain."

Lorna Romero, a spokeswoman for McCain, said in a statement that voters appreciate his “independent conservative leadership.”

“As we enter the final weeks of this campaign, John McCain is well-positioned for reelection, a sentiment that recent public polling has affirmed,” Romero said. “With multiple field offices and hundreds of volunteers making more than 4 million voter contacts, John McCain has the strongest grassroots campaign operation in Arizona, and the momentum is clearly on our side.”