Potential GOP candidates for president are losing to former Secretary of State and presumed Democratic frontrunner Hillary Clinton in three crucial swing states in 2016, according to a Quinnipiac poll released Tuesday. Former Florida Gov. Jeb Bush had the best chance at defeating Clinton in swing states -- he’s in a virtual tie with her in his home state.

“There is a reason why Hillary Clinton has followed a slower, less aggressive schedule when it comes to ramping up her expected presidential campaign than have virtually all of her potential White House opponents,” said Peter A. Brown, assistant director of the Quinnipiac University Poll. “She holds double-digit leads over all her potential GOP opponents in the three biggest swing states, except for two native sons, former Florida Gov. Jeb Bush and Ohio Gov. John Kasich. And she is under little pressure from within her own party to hit the campaign trail.”

Bush, who launched a leadership PAC last month to fund staff and travel as he weighs a presidential campaign, had the best shot at beating Clinton in the swing states of Florida, Ohio and Pennsylvania, among possible candidates whose names were given to the poll’s respondents. Clinton had just a one-point lead over Bush in Florida, 44 percent to 43 percent. While Clinton leads by 11 points over Bush in Ohio with 47 percent to 36 percent, it’s the best margin for Republicans aside from Kasich, whom Clinton leads 44 percent to 43 percent in his home state. And it's unknown if Kasich is even running.

Clinton had a 6-point lead over Sen. Marco Rubio, R-Fla., in the Sunshine State, while she had a 20-point advantage, 54 percent to 34 percent, over former Sen. Rick Santorum of Pennsylvania in his state. New Jersey Gov. Chris Christie, whose state is adjacent to Pennsylvania, posted the best result against Clinton in the Keystone State but still trailed by 11 points, 50 percent to 39 percent.

Clinton recently pushed back her expected campaign announcement to August, according to Politico