>Parenting seems heavily R biased. I didn’t think parenting would be political

It's easy to fear monger to parents and having children, especially at young ages, has got to skew Republican. Democrats tend to be more educated, which means they often postpone having children or don't have children at all.

>Electoral Reform seems heavily D biased. I thought republicans made most noise about corrupt voting processes etc?

Republicans only oppose corrupt/undemocratic voting processes when it doesn't favour them. They are fine with the electoral college, gerrymandering, disenfranchisement of black voters, a very unrepresentative senate electoral process, DC and US territories not being allowed to vote for certain elections, and plurality voting. Most Republicans won't even admit many of these things are problems.

Basically anyone interested in electoral reform in the US would vote Democrat and the democrats are probably advertising to both raise awareness of these issues and get people who care about them out to vote.