WASHINGTON — Hillary Rodham Clinton holds double-digit leads over potential Republican challengers Jeb Bush and Mitt Romney as the likely Democratic presidential candidate moves closer to entering the race, a new Washington Post-ABC News poll finds.

Although Clinton, Bush and Romney are all longtime politicians and members of political dynasties, registered voters are less likely to count that familiarity against Clinton. That is a good sign for Clinton, a failed 2008 presidential candidate and the focus of Republican criticism that her time has come and gone.

Clinton’s potential to make history as the first female U.S. president makes little difference to most voters and is a net positive for others.

The former first lady, U.S. senator from New York and secretary of state has said she is considering a second run for the White House. She joked about the anticipation surrounding her decision during remarks in Canada on Wednesday but did not offer hints about her thinking or the timing of a possible announcement. Democratic strategists say she is likely to enter the race in late March or April – some 10 months before the first 2016 primary contest in Iowa.

Clinton approaches the nominating season in a dominant position, leading Bush by 54 percent to 41 percent among registered voters and Romney by 55 percent to 40 percent.

Beyond Bush and Romney – both former governors and the two Republicans who have made the firmest moves toward a 2016 run – Clinton holds equally large leads over other potential Republican hopefuls. She tops Sen. Rand Paul, R-Ky., and New Jersey Gov. Chris Christie by 13 percentage points each, and leads former Arkansas governor Mike Huckabee by 17 points.

Clinton’s husband, former president Bill Clinton, appears to create little drag on her potential.

Among all voting-age adults, more than 6 in 10 say the fact that Bill Clinton served as president has no bearing on whether they would support Hillary Clinton’s candidacy. And among those who say her spouse’s presidency will matter, 23 percent say it will make them more likely to support her, while 14 percent say less likely.

A presumed voter distaste for dynasties has long been seen as a barrier to Clinton should she run, along with a sense, off-putting to some, that Clinton’s candidacy has been a foregone conclusion for years.

Jeb Bush’s family connections are less benign. A 55 percent majority says the fact that Bush’s father and brother served as president would not make them more or less likely to support him. But among those for which this will be a factor, it runs in a negative direction by 3 to 1.