AP:

In a bitter fight, Colorado Democrats recently muscled through the Statehouse a massive elections reform bill that allows voters to register up until Election Day and still cast their ballots.

It’s the latest – and most substantial – development in a nationwide Democratic Party effort to strike back at two years of Republican success in passing measures to require identification at polling places and purge rolls of suspect voters.

Democratic-controlled states like California, Connecticut and Maryland also all have sought to make it easier to cast a ballot as late as possible. They recently passed versions of same-day voter registration measures, which traditionally help younger and poorer voters – the sort who lean Democratic.

Undaunted, the GOP is aggressively fighting the efforts.