(CNN) - Another Senate Republican is officially skipping the party's national convention next month, the latest sign vulnerable Republicans may be wary of linking themselves to the GOP brand this election cycle.
Pat Roberts, the two-term senator from Kansas who finds himself in a closer re-election bid than initially expected, won't be on hand to see Sen. John McCain accept the Republican presidential nomination in Minneapolis, his spokesman Molly Haase confirmed to CNN.
Roberts will instead be completing a 105-county tour of the state, Haase said. Polls show Roberts holds a double digit lead over Democratic challenger Jim Slattery, though the race has narrowed over the last several weeks.
Roberts joins a handful of vulnerable Senate Republicans who have flatly said they will not attend the convention, including Susan Collins of Maine, Gordon Smith of Oregon, Ted Stevens of Alaska, and Elizabeth Dole of North Carolina.
Two other vulnerable Republicans - New Hampshire Sen. John Sununu and Mississippi Sen. Roger Wicker - have yet to announce if they will attend.
Roberts' decision comes a week after Republican Congressional Committee Chair Tom Cole reportedly suggested some embattled Republicans should steer clear of the GOP Convention.
According to a report in The Hill, the Oklahoma congressman also urged Republican lawmakers to feel free to criticize the party -– including prospective future colleagues - citing dismal congressional approval ratings. “These ratings are worse than we had on the eve of losing the majority,” he said. “Don’t be afraid to say you are disappointed in fellow Republicans… don’t hesitate to be anti-Washington, D.C."