Republicans have narrowed the trust gap with Democrats and are gaining on President Obama, according to a new Washington Post-ABC News poll.

Though the poll shows Obama’s overall approval rating remaining at 51 percent, it reinforces the results of a number of recent surveys showing the president’s support eroding in key domestic priorities – health-care, the deficit, jobs, and the economy — in which he previously enjoyed double-digit advantages over Republicans:

When compared with the early months of Obama’s presidency, the GOP’s overall gains are striking. A year ago, Democrats held a 26-point advantage on dealing with the big issues; that lead is now six points. At the one-month mark, Obama’s lead over the Republicans on dealing with the economy was 35 points; it’s now five points.

The poll also shows a majority opposed to the president’s decision to try terrorists in federal courts.

The news for November is more mixed, but is trending toward the GOP. Respondents were split dead even on the question of how they would vote in November Congressional elections — 46 percent with Republicans, 46 percent with Democrats. That is down from a 51–39 advantage Democrats held just four months ago.

With more than 70 percent of Americans disapproving of the job Congress is doing, nearly half are describing their mood as “anti-incumbent.” On a generic Congressional ballot, independents favor Republicans by a 51–35 margin.

As the Post notes, the survey shows an electorate that looks much as it did in 1994 and 2006, both years that saw shifts in dramatic shifts in control of Congress.

You can see a graphical snapshot of the polling results here and read the data here.