The Democratic Congressional Campaign Committee -- looking to cement the Dems' majority in the House -- is eyeing a bunch of GOP-held House districts where the incumbents look ready to retire or run for other offices, today's Roll Call reports. The Dems' expectation is that retirements -- or dissatisfaction with being in the minority -- could cause a wave of GOP defections that will leave behind districts that could then be ripe for a Dem pickup, the paper says.

Among the more than two dozen GOPers Dems are watching:

* Rep. Mike Castle (R-Del.), who "suffered a minor stroke last year, may mount a Senate race if Sen. Joseph Biden (D-Del.) vacates his seat to concentrate full time on his presidential bid.

* Rep. Gary Miller (R-Calif.), who "reportedly is under FBI investigation, which has Democrats dreaming about his Inland Empire-based 42nd district, even though it gave Bush 62 percent of the vote in 2004."

* Rep. Jerry Lewis (R-Calif.), former Appropriations Committee chairman, also is being scrutinized by federal authorities.

* Rep. Barbara Cubin (R-Wyo.), who "seemed to invite the DCCC to come after her when she won a seventh term by barely 1,000 votes in the Equality State in November, where only 29 percent of the electorate supported Kerry in 2004."