SALEM, Ore. (AP) — Oregon’s public sector unions are pushing a ballot measure that would limit the ability of the minority party in the Legislature to use walkouts to block legislation. Republicans have used the tactic frequently at the Capitol in recent years to try to thwart the agenda of Democrats, who have firm control of both the state House and Senate. Oregon Public Broadcasting reports that under the proposal, a lawmaker who is marked unexcused by a chamber’s presiding officer 10 or more times in a single legislative session would be barred under the state Constitution from seeking re-election. To qualify for the November ballot, state elections officials will need to determine that at least 149,360 signatures submitted are from registered Oregon voters.