Del. Robert G. Marshall (R-Prince William), who has long said he is weighing a run for U.S. Senate this year, has asked Attorney General Ken Cuccinelli II (R) for an opinion on how to collect signatures for a possible run.

Candidates have until March 29 to collect 10,000 signatures from across the state, including 400 from each of the 11 congressional districts, to get their names on the ballot.

The General Assembly failed to complete congressional redistricting last year, and Marshall said he does not know whether he should collect signatures from the existing districts or yet-to-be-drawn new ones.

“This is a serious thing,” Marshall said.

It’s unclear whether other Senate candidates are collecting signatures from the existing districts.

Former senator George Allen; Jamie Radtke, former chairwoman of the Virginia Federation of Tea Party Patriots; Hampton Roads lawyer David McCormick; and Bishop Earl Jackson are vying in the June GOP primary.

Marshall almost defeated former governor James S. Gilmore III to capture the Republican nomination for U.S. Senate at a 2008 convention to run against former Democratic governor Mark Warner. The margin was less than one percentage point.

Virginia’s ballot requirements have come under scrutiny since former House speaker Newt Gingrich and Texas Gov. Rick Perry did not qualify for the Republican presidential primary ballot.