Fully half of Americans oppose the tea party political movement, according to a new Washington Post-ABC News poll, and “strong” opponents outnumber strong supporters by a 2 to 1 margin. Four in 10 adults continue to back the movement, but an ideological split between more and less committed tea party supporters also threatens prospects of a unified front in 2012.

The intensity of tea party support matters. In the new Post-ABC poll, Mitt Romney runs about even with Newt Gingrich among Republicans and GOP-leaning independents who strongly support the tea party, but Romney holds a 17-point lead over other contenders among Republicans who are only “somewhat” supportive.

Among Americans more broadly, 13 percent are strong tea party supporters and 28 percent back the movement “somewhat.” Over half of strong tea party backers are Republicans, compared with fewer than four in 10 casual supporters. And while more than eight in 10 strong tea party supporters say their political views are “conservative,” about half as many weak tea party supporters say the same.

Overwhelming majorities of all tea party supporters disapprove of the way president Obama is doing his job, but the strongest tea party supporters are nearly unanimous: 93 percent give the president negative job ratings. By comparison, 68 percent of those who support the tea party “somewhat” disapprove of Obama’s performance, while 31 percent approve of his performance.

More from the Post polling team

Sign up for Post polling e-mails

Follow Post polling on Twitter

Like Post Politics on Facebook