The tension between the Republicans and Conservatives is not limited to the governor’s race, and there’s now a distinct possibility that the erstwhile allies could end up running different candidates in three statewide contests.

A lot of GOP county chairs have been scratching their heads about the Conservatives’ decision last Friday to give their line to little-known consultant Jay Townsend to run against Sen. Chuck Schumer and former Rep. Joe DioGuardi to challenge Sen. Kirsten Gillibrand.

Most Republicans have been expecting both economist David Malpass and former Long Island Legislator Bruce Blakeman to receive sufficient support at this week’s convention to get onto the ballot, setting up a two-way primary.

DioGuardi wasn’t believed to have enough support to get on the GOP ballot, although he may have the inside track with the Independence Party. Now that he has landed the Conservative line, however, it could cause some county chairs to take a second look.

It was suggested to me over the weekend that the Conservative backing of DioGuardi is more of a goodwill gesture than anything else – a reward, if you will, for the former congressman’s willingness to quit his longshot US Senate run in 2000 to clear the way for Rick Lazio to challenge Hillary Clinton.

What? You didn’t remember that DioGuardi was in the race that year? Well, me neither. But as it turns out, he was running for a good six months with Conservative backing and was very critical of the GOP contender, former NYC Mayor Rudy Giuliani, (who, it should be noted, is no favorite of state Conservative Party Chairman Mike Long, either).

Long admitted to me during an interview that will air on “Capital Tonight” this evening at 8 p.m. and 11:30 p.m. that he feels both the Republicans and the Conservatives “owe” DioGuardi a debt of gratitude and should rally behind his candidacy this time around.

As for Towsend, Long said he believes the consultant is really going to give Schumer a run for his money. But another contender, Gary Berntsen, has the support of four of the state GOP regional vice chairs and a number of upstate county chairs, too.

Another would-be Republican challenger to Schumer, Nassau County Comptroller George Maragos, has started to build some support, too, landing endorsements in Orange County and Clinton County.