If you're 16 in this country, you can drive, get a job and pay taxes — even marry or buy a gun, in some states. But you can't vote in national elections. Massachusetts Congresswoman Ayanna Pressley is trying to change that. The freshman lawmaker introduced her first amendment in Congress Tuesday. It's a proposal to lower the national voting age from 18 to 16. Pressley's amendment is being added to a sweeping, election-reform bill in the House of Representatives. That bill is in the hands of the House Rules Committee, chaired by Massachusetts Congressman Jim McGovern. And in Boston, city...