India, June 22 -- The Democrats have asked the Federal Election Commission to investigate a covert Republican effort to influence Democratic primaries in key House races.

Two pop-up super PACs supported candidates deemed less electable by spending over $4.3 million in a range of Democratic congressional primaries.

Democrats suspected Republican intervention after the two groups, Real Change PAC and Lead Left, spent substantially in Democratic primary elections in Texas, Pennsylvania, New Jersey, Nebraska, and Maine in recent months.

Real Change PAC and Lead Left, two pop-up super PACs, were exclusively funded by Conservative Americans PAC, according to Federal Election Commission disclosures submitted late on Saturday.

Together, the t...