You want to get people to vote for your candidate. So you create social media posts saying the opponent voted against funds that would go to veterans. You don't need to look anything up, you just need to create the post. It's almost certainly true, because EVERY candidate has done this. However, it's extremely misleading...
Your opponent wants to make sure people understand the truth. The truth is that there were several bills that would fund veterans with a small amount of money, but they were all "add-ons" to other bills that did major things that the candidate did not approve of (for example, something like saying no state may provide a drivers license to anyone that is an ex-con). Now, in order make sure people understand the truth, you have to find the cases where the candidate in question voted against money for veterans, explain what the situation behind it was, and why there was "something bigger to consider" in each case.
Vs you, who only had to create a simple post.
The level of effort is in no way balanced.