Lt. Gov. Bill Bolling (Steve Helber/Associated Press)

Former governor and senator George Allen held a fundraiser for Stanley at his Martinsville headquarters Thursday. Gov. Bob McDonnell will headline a fundraiser for Stanley at a home in Glade Hill on Friday night. And Lt. Gov. Bill Bolling will speak at a picnic for Stanley in Stuart on Saturday afternoon.

“Lt. Gov. Bolling presides in the Senate during session, and is keenly aware of the difficulties faced by conservatives to create a better Virginia,’’ Stanley said. “He knows how often legislation that would benefit hard-working families, small businesses, and businesses looking to relocate, that would provide jobs and stabilize our damaged economy, dies in Democratic-controlled committees, or is voted down by the Democrats.”

Stanley (R) announced in May that he would move and seek reelection in November in the newly redrawn 20th district — currently held by Sen. Roscoe Reynolds (D).

It marks the first time in two decades that a pair of Virginia senators are competing with one another in a general election.

Stanley’s Southside Virginia district was split into four during redistricting, with 40 percent of his old district drawn into the one Reynolds holds.

The new map, approved by the Democratic-led Senate, also merges the districts of the Roanoke-Lynchburg region’s Republican senators, Ralph K. Smith and Stephen D. Newman.

Smith announced that he would move and seek reelection in the newly redrawn 19th district, Stanley’s current district.

Republicans see the Stanley-Reynolds race as one that could help them win control of the Senate, where Democrats hold a 22 to 18 majority.

Stanley won a special election earlier this year. Reynolds has been in the Senate since 1997.