Clinton takes hit in new poll

Hillary ClintonHillary Rodham ClintonGOP: Obama ‘in denial’ about healthcare law failures Is Georgia turning blue? Trump to lay out first 100 days in Gettysburg speech MORE's unfavorable ratings are rising, as her campaign faces questions over donations to the Clinton family's foundation, but she still leads in general election match-ups against top possible Republican presidential candidates.

Her positive and negative ratings are split at 42 percent in a Wall Street Journal/NBC news poll released Tuesday, with her unfavorables up from 36 percent last month. Over the last year, her numbers on "having high personal standards," "being compassionate," and "being honest and straightforward," have all dipped.

But Clinton still leads all of her hypothetical Republican challengers for a general election match-up. And her split favorability rating is better than those of the top likely Republican challengers, whose ratings are underwater.

She's ahead of former Florida Gov. Jeb Bush and Sen. Marco Rubio (Fla.) by 6 percentage points each, at 49 percent to 43 percent. She also leads Wisconsin Gov. Scott Walker by 10 percentage points, at 50 percent to 40 percent.

Her tightest margin comes against Sen. Rand Paul (Ky.), who only trails her by 3 percentage points, at 47 percent to 44 percent.

On the Republican side, Bush leads the group with 23 percent of voters selecting him as their first choice; Rubio comes in second with 18 percent. Walker comes next with 14 percent, followed by Paul and Sen. Ted Cruz (Texas) at 11 percent.