U.S. Republican senator moves toward re-election read more at here www.spinonews.com/index.php/item/853-u-s-republican-senator-moves-toward-re-election

Senator Kelly Ayotte of New Hampshire still faces a tough general election challenge on Nov. 8 but she crushed a pro-Trump, Republican challenger in a primary contest, winning close to 80 percent of the vote.

Ayotte has refused to endorse Trump although, like a number of Republicans, she has said she will vote for him.

Another U.S. Republican senator has moved closer to re-election while keeping some distance from Donald Trump, and experts say this suggests the party's presidential candidate may be having little down-ballot impact, at least at the primary stage.

Some Republicans, such as Ohio Senator Rob Portman, have endorsed Trump but excluded him from their campaigns. Senator Lisa Murkowski of Alaska won her primary in August although she had said she did not know whether she would vote for Trump.

Trump, a New York businessman who has never held elected office, at first criticized Ayotte. Then he changed course early last month and endorsed her, along with fellow Republicans House Speaker Paul Ryan and Senator John McCain.

With Ayotte's victory, all incumbent Republican senators running for re-election have won their primaries this year. This is not uncommon but it is unusual for so many senators to hold their party's presidential nominee at arm's length.

U.S. senators serve six-year-terms. One-third of the 100-member Senate faces voters every two years.

The outcome so far shows some voters are distinguishing this year between Trump and the rest of the ballot, said Nathan Gonzales, editor of The Rothenberg & Gonzales Political Report, a non-partisan newsletter.

Ohio's Portman, who has not appeared with Trump on the campaign trail, easily beat his primary opponent and has opened up a lead over his Democratic challenger in the general election.

McCain and Ryan have had very public differences of opinion with Trump but they also prevailed in their primary races.

Ayotte beat a field of four challengers in New Hampshire, receiving nearly 80 percent of the vote, according to election results posted online by the state.

"I think you probably have a lot of people in the primary who were not going to pay as close attention to what she was saying about Trump," Ornstein said of Ayotte. "In the fall it may be a different matter, as certainly Maggie Hassan is going to try to tie her to Trump.”