Crossroads GPS has purchased $20,000 worth of online advertising in support of Rep. Larry Bucshon, R-Ind., according to a forthcoming news release shared first with CQ Roll Call.

The GOP super PAC’s buy is likely meant to bolster Bucshon’s re-election; some Republicans speculate that the two-term incumbent could face a primary challenge in 2014.

The advertisement will appear on Facebook, as a pre-roll ad on YouTube and on other online sharing sites. The issue spot thanks Bucshon for supporting the Save American Workers Act, which would restore the “40-hour workweek.”

The race is rated Safe Republican by Rothenberg Political Report/Roll Call.

CQ Roll Call reported in June that Bucshon could face a primary challenge, and the Club for Growth features Buchson on its “Primary My Congressman” webpage.