Rep. Andy Barr has maintained his early fundraising edge in the crowded Republican primary to succeed GOP Sen. Mitch McConnell in Kentucky.

Barr raised $1.8 million between the beginning of July and the end of September and ended the quarter with $6.7 million in the bank, according to his Wednesday filing with the Federal Election Commission .

Barr’s robust war chest — three times larger than his two competitors’ combined — underscores his sustained momentum in the high-profile race. He also had a cash-on-hand advantage at the end of the second quarter.

Businessman Nate Morris raised $4 million, but the bulk of that — roughly $3 million — came…

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