Create national standards for a uniform system of voting in national elections. Do redistricting after a census on a national level rather than giving state legislators this power.
Why is this important?
The election of 2012 demonstrated how the current state controlled system can be manipulated to disenfranchise and inconvenience many voters. Leaving redisticting to the states allows gerrymandering to occur whch can favor a party or an incumbent unfairly (i.e. the 2012 congressional election in which one party won a majority of the popular vote but the other party won more seats).
