But pitching, a strength throughout the resurgence, has proved troublesome.
The disturbances have provided the candidates with a platform to declare their support for Israel, but the Middle East has proved troublesome to both.
That has proved troublesome for law enforcement authorities as more Americans begin to use high-speed Internet service through cable networks.
But the question of what to do with Parliament's upper house, a historically powerful body that was stripped of most of its authority nearly 100 years ago, has proved troublesome for Mr. Blair.
Releasing inmates has proved troublesome to politicians nationally, from Michael S. Dukakis, whose presidential campaign in 1988 was put on the defensive because of Willie Horton, a convicted murderer who committed a rape while on furlough from a Massachusetts prison, to Mike Huckabee, the former Arkansas governor, whose clemency record was questioned this year.
The final composition of the men's team pursuit squad is still to be determined, with six riders – Ed Clancy, Geraint Thomas, Steven Burke, Peter Kennaugh, Ben Swift and Andy Tennant – vying for selection in Melbourne, while the men's team sprint has proved troublesome.
Ensuring the safe use of edible marijuana products has proven troublesome since marijuana sales began in Colorado in January.
Section 304, which has proven troublesome to apply because of its vagueness, also requires a finding of "misconduct," which the commission has not made.
The move by the former secretary of State represents a calculated risk on an issue that has proven troublesome for her party in the past.
