The Democratic Senatorial Campaign Committee (DSCC) is spending money on Sen. Arlen Specter's (D-Pa.) increasingly difficult primary.

As poll numbers show Rep. Joe Sestak (D-Pa.) catching up to the senator, a source confirms the DSCC is spending coordinated funds for Specter. The spending was first reported by my former colleague, Reid Wilson.

Coordinated funds differ from most party spending in that the committee can use the money to work with the candidate and supplement his or her ad buys. But such funds are capped at a certain amount depending on the race — $855,400 in the Pennsylvania Senate race — while non-coordinated or independent expenditure funds can be spent in unlimited amounts.

The DSCC has openly backed Specter over Sestak, but actually spending money on the race is a more unusual step. Specter is also getting an assist from President Barack ObamaBarack Hussein ObamaOvernight Cybersecurity: What we learned from Carter Page's House Intel testimony | House to mark up foreign intel reform law | FBI can't access Texas shooter's phone | Sessions to testify at hearing amid Russia scrutiny Russian social media is the modern-day Trojan horse Trump records robo-call for Gillespie: He'll help 'make America great again' MORE, who has cut a radio ad for him.

The committee spending has already led the National Republican Senatorial Committee (NRSC) to ask whether the DSCC will do something similar for Sens. Michael BennetMichael Farrand BennetBipartisan lawmakers can rebuild trust by passing infusion therapy bill GAO to investigate Trump's voter fraud commission 2 election integrity commission members protest lack of transparency MORE (D-Colo.) and Blanche Lincoln (D-Ark.), who both face primaries as well.