A Zogby telephone poll conducted last week shows that among 10 possible candidates, 21 percent say they think Democratic Gov. Rod Blagojevich should appoint Jackson to the seat when Obama leaves it vacant in January.

The only other potential candidate to get double-digit support was Tammy Duckworth, a former Democratic congresswoman candidate from a Chicago district. Fourteen percent of respondents said she should be appointed.

In two prospective Senate races, Jackson would defeat Republican Congressman Ray LaHood by a 50 percent to 31 percent margin, the survey shows.

The poll of 802 likely voters statewide has a margin of error of plus or minus 3.5 percentage points.