Hillary Clinton has widened her lead over Donald Trump in several states, including battlegrounds like New Hampshire, Pennsylvania and Colorado, as more voters say the business mogul is not qualified to be president, according to polls from those states.

The polls also indicate that voter wariness of the Republican nominee could hamstring the party’s push to maintain control of the Senate, with Republicans losing ground in several key races.

The advantage for Clinton is so strong in Colorado, a traditional swing state, that the campaign temporarily stopped buying advertisements there in July, diverting the money to other regions, according to The Colorado Independent and other media sources. Clinton campaigned in Colorado on Wednesday.

“Colorado is no longer a battleground state,” prominent Colorado political analyst Floyd Ciruli wrote on a blog for his Ciruli and Associates consulting firm. Ciruli cited several trends, including a growing Hispanic population and a local Republican Party that has been hostile to Trump.

Colorado Republican officials said, however, they were confident about their chances, a sentiment that was shared by Trump.

“We’re going to win in ’16, I have no doubt about it,” state party Chairman Steve House told GOP voters at a recent event in Colorado Springs, according to the newspaper.

Trump told supporters there in July that he was not concerned.

“We do have to win Colorado,” he said during a July 1 speech in Denver, according to the paper. “I will be back a lot, don’t worry about it. I will be back a lot.”

Clinton was leading over Trump by an average of 8 points in polls compiled by Real Clear Politics in early July. Democratic Sen. Michael Bennet was polling an average of 12 points ahead of Republican Darryl Glenn. Bennet was once considered vulnerable and offered Republicans a rare chance to flip a Senate seat. The Republican challenge, though, has been hampered by allegations of voter signature fraud and resignations of top party officials.

The numbers show similar spikes for Clinton and down-ballot Democrats in other states.

Clinton is leading Trump by 15 points in New Hampshire, according to the Boston public radio station WBUR . That lead was attributed partly to a post-convention bump. The last time the station polled the state three months ago, the race was virtually tied.

“After all the hand-wringing about whether Bernie Sanders supporters would end up supporting Hillary Clinton, she’s now getting 86 percent of the Democratic vote,” Steve Koczela, president of the MassINC Polling Group, which conducted the WBUR survey, told the station. “Donald Trump, on the other hand, has slipped a bit among Republicans. He’s now getting a bit less than two-thirds of the Republican vote.”

The WBUR survey also found that, while voters were split about Clinton’s fitness for the job, their concerns about Trump were far greater. Forty-eight percent of likely voters say Clinton is fit to be president, 46 percent say she’s not, it found. Less than a third say Trump is qualified, and more than 60 percent say he’s not.