Looks like the ideal for deficit control is to have a democratic president and republican control of both houses of Congress. Unified government by either party leads to less constraint on spending.
If Democrats make up half the team that you claim is most effective at limiting deficits, it would seem to me to be difficult to sustain the argument that Democrats don't care about them.
http://goliards.us/adelphi/deficits/index.html is more useful. It shows party control of the presidency, house, and senate and deficits each year, not just at end of term.
Looks like the ideal for deficit control is to have a democratic president and republican control of both houses of Congress. Unified government by either party leads to less constraint on spending.