Obviously, he was incorrect, but that was only because the South seceded and brought the issue to a head because they mistrusted Lincoln. It was ironic that the Republicans shunned a man who so articulately voiced an opinion that would have likely been shared by the party's founder. As you consider how you'll vote on military spending, keep the positive trickle down effects of a strong military in mind. Military members are tax-paying, gainfully employed, consumers. Cuts in military spending will decrease not only the amount of new military gadgets and gizmos in the short term, it will also cut down the number of service members in the long term.
Some investments pay multiple dividends.
Continuing investment in the military is one. I have argued before that the standing Army should not need to number more than a quarter million or so. The Marines should stay at their current strength. The troops and equipment phased out of the regulars should then be input to the National Guard to dramatically improve its readiness. I would not support any reduction in air power.