Proposals to hold Pennsylvania’s presidential primaries in March rather than April and to permit poll watchers to operate outside the counties where they live were advanced Wednesday by a divided House State Government Committee.Both bills had already passed the state Senate and were approved for consideration by the full House. The state’s primary during presidential election years would be moved from the fourth Tuesday in April to the third Tuesday in March. Supporters say the change would position the state to have more of an impact on the parties’ choice of presidential candidates. The vote was 16-8, with two Democrats joining all Republicans in favor.