Senate candidates mapping the race
The two supposed frontrunners, Democrat Chris Murphy and Republican Linda McMahon are prominently featuring mapped data on their homepages.
The maps contain slightly different data, but the messages seem to be the same: "Look how widespread our support is. Wouldn't you like to be a part of this?"
Murphy is mapping both endorsements and donations (in the map below, red is for donations, blue is for endorsements). Though it's not interactive, Murphy does offer a super-high-res version.
McMahon is tracking just endorsements, but her map offers an interactive look what her supporters are saying. Which is nice. You can zoom down to street level.