Republican congressman Todd Akin rebukes party bosses
A Republican candidate under fire for saying women's bodies can prevent pregnancy in rape cases has lashed out at party bosses who want him to quit.
Congressman Todd Akin said it was not right for the party establishment to over-ride Missouri voters who had picked him to run for the Senate.
In a new fundraising appeal, Mr Akin claims "the liberal elite" are trying to take down a "pro-life conservative".
But he has agreed not to attend next week's party convention.
Correspondents say the furore over Mr Akin's rape remarks could derail the Republican campaign to win control of the US Senate in November's elections.
Prominent Republicans have lined up to call on him to quit, while the party and its supporters have pulled the plug on millions of dollars of funding.
But Mr Akin struck his most defiant tone yet on ABC's Good Morning America programme on Wednesday: "The people of Missouri chose me, and I don't believe it's right for party bosses to decide to over-ride those voters.
"It makes me uncomfortable to think that the party bosses are going to dictate who runs, as opposed to the election process."
He also continued to back-pedal from his comments last Sunday about "legitimate rape", accepting that the views he expressed were "medically wrong".
Although Tuesday was the final day for Mr Akin to withdraw from the race without a court order, he did not categorically rule out stepping aside at a later date.
"I'm never going to say everything that could possibly happen," he told ABC. "I don't know the future."
Mr Akin also confirmed that Republican vice-presidential candidate Paul Ryan had urged him to end his campaign.
While Republican presidential candidate Mitt Romney has said he believes abortion should be allowed for rape victims, his running mate has previously taken a harder line.
Mr Ryan, a Wisconsin congressman, co-sponsored along with Mr Akin and other lawmakers a controversial bill that would ban federal funding for abortion with a rape-exception only in cases of "forcible rape".
On Wednesday, the Republican running mate was asked in an interview to define forcible rape.
He told Pittsburgh television station KDKA: "Rape is rape and there's no splitting hairs over rape."
Democrats are trying to portray Mr Akin's comments on rape as symptomatic of a negative attitude towards women across the Republican party.
There has been renewed focus on a Republican convention platform, which resurfaces every election year, for a constitutional ban on abortion with no exceptions for rape or incest. It will be voted on next Monday at the party gala in Tampa, Florida.
In an appeal for $5 campaign donations on Wednesday, Mr Akin appeared to pitch to Christian evangelicals, anti-abortion activists and anti-establishment Republicans.
He accused Republicans of trying to "duck and run for cover" in the face of adversity over the row.
Obama poll lead
A new NBC/WSJ poll gives the Obama-Biden ticket a lead of 48-44% over Romney-Ryan.
It also found that voters felt Mr Obama would handle women's issues better than Mr Romney by 52-24%.
Just two weeks ago Mr Akin was riding high in the Missouri opinion polls over Democratic incumbent Claire McAskill.
Then on Sunday, he was asked by a local news station if he would support abortions for women who have been raped.
He said: "If it's a legitimate rape, the female body has ways to try to shut that whole [pregnancy] thing down."
Senator McCaskill, whose campaign appears reinvigorated by the fallout, has not joined the calls for her rival to step aside.