A new Washington Post-ABC News poll shows that Republicans are deserting Sarah Palin’s sinking ship.

For the first time in Post-ABC News polling, fewer than six in 10 Republicans and GOP-leaning independents see Palin in a favorable light, down from a stratospheric 88 percent in the days after the 2008 Republican National Convention and 70 percent as recently as October.

In one sense, the poll still finds Palin near the top of a list of eight potential contenders for the GOP nomination. The former vice presidential candidate scores a 58 percent favorable rating, close to the 61 percent for former Arkansas governor Mike Huckabee and 60 percent for former Massachusetts governor Mitt Romney, and better than the 55 percent that onetime House speaker Newt Gingrich (Ga.) received.

But Palin’s unfavorable numbers are significantly higher than they are for any of these possible competitors. Fully 37 percent of all Republicans and GOP-leaning independents now hold a negative view of her, a new high.

Note that this shouldn’t be taken as a sign of burgeoning sanity in the GOP; the current frontrunner is deranged squirrel-eating theocrat Mike Huckabee.