Former Secretary of State Hillary Clinton’s favorability rating fell below 50 percent this week for the first time in six years, but it's still higher than those of her potential 2016 presidential election opponents, according to a Fox News poll released Thursday.

Forty-nine percent of the 1,012 registered voters surveyed from April 13-15 said they view Clinton favorably, while 45 percent have an unfavorable view. Clinton hasn’t seen such a low rating since April 2008, when the Democratic presidential primaries were underway. At that point, she had a 47 percent favorable rating.

Here’s how her potential Republican rivals compare in terms of favorability: Gov. Chris Christie of New Jersey received a 36 percent approval rating; former Florida Gov. Jeb Bush and Sen. Rand Paul of Kentucky both received a 32 percent rating; and Sen. Ted Cruz of Texas got a 23 percent approval rating.

At the moment, Clinton admits only to just “thinking about” a presidential run, but numerous polls show her as Democratic voters’ top pick if and when she makes that decision. 

In this Fox News poll, 69 percent of respondents said they would like to see Clinton get the Democratic presidential nomination. Other rumored Democratic candidates, such as Vice President Joe Biden and Massachusetts Sen. Elizabeth Warren, trailed with 14 percent and 6 percent, respectively.

The poll has a margin of error of plus or minus three percentage points.