Here's one more reason to continue speculating about whether Vice President Joe Biden will enter the presidential race: he polls better nationally against the leading three Republican candidates than Hillary Clinton, and has a higher favorability rating, too.

According to a Quinnipiac University poll released Thursday, if Biden was the democratic candidate, he would beat Donald Trump by eight points (48 - 40 percent), former Florida Governor Jeb Bush by six points (45 - 39) and Senator Marco Rubio by three points (44 - 41). Clinton only beats Trump by four points (45 - 41), Bush by two points (42 - 40) and Rubio by one point (44 - 43).

Eighty-three percent of Democrats view Biden favorably, compared to 76 percent and 54 percent who approve of Clinton and Vermont Senator Sanders, respectively. Among all registered voters, Biden has a 48 percent favorability rating, while Clinton came in at 39 percent and Sanders at 32 percent.

“Note to Biden: They like you, they really like you, or they like you more than the others,” Tim Malloy, assistant director of the Quinnipiac University Poll, said in a press release accompanying the poll. “If he is sitting on the fence, his scores in the matchups and his favorability ratings may compel him to say, ‘Let's do this.’”

The good news for Clinton is that she's still leading the race to become the Democratic nominee—45 percent of Democrats polled would choose Clinton as the party nominee, 22 percent would choose Sanders and 18 percent would choose Biden. No other Democrat polls above 1 percent. 

The ongoing questions about Clinton's private e-mail server may have created an opening for Biden, who is expected to make a decision on whether he'll enter the race or not by Oct. 1. A Biden run would provide nervous Democrats an alternative to Clinton. Last week, a separate Quinnipiac poll found that Biden performed as well as or better than Clinton against leading Republicans in Florida, Ohio, and Pennsylvania, three swing states seen as key to winning the general election.