The $30K online buy against the GOP House hopeful points to abortion, gay marriage and gun views.
Comstock defeated five opponents in the "firehouse" primary to succeed Rep. Frank Wolf.
The Citizens United survey shows the GOP delegate taking 44 percent of the primary vote.
Rob Wasinger (R) has resigned as chief of staff for Rep. Kerry Bentivolio (R-Mich.).
Del. Bob Marshall and former Senate candidate Howie Lind could complicate Comstock's chances.
Sen. Black's decision potentially clears the way for Virginia Del. Barbara Comstock (R).
Tim Phillips is endorsing Comstock to succeed retiring Rep. Frank Wolf (R-Va.).
Levin says he won't be the only conservative backing Comstock in Virginia.
The GOP has rallied to the delegate after her opponent said she's never worked a "real job."
"Barbara Comstock is a solid and reliable conservative," said the conservative commentator.
Virginia Del. Bob Marshall (R) will join the crowded Northern Virginia race for Congress.
Virginia Del. Barbara Comstock (R) has quickly amassed a strong war chest.
Comstock is looking like more of a lock for the GOP nomination.
Calling themselves the "Wolf Pack, current and former staffers praise Comstock for Congress.
The group calls Comstock "the future of the conservative movement."
The Va. delegate could face a conservative challenger in trying to succeed her former boss.