SCOTT BROWN campaigned for the US Senate as a problem solver who values good ideas more than partisan labels, and he should make good on that vow in the debate over a bill to create jobs. What began as an ambitious package of business tax breaks and other incentives has given way to a timid $15 billion measure that will have only minor effects on unemployment. Brown could end an impasse - and dispel profound mutual distrust between Democrats and Republicans - by signaling a serious commitment to help develop and pass a more ambitious jobs bill.