President Reagan says it would be "ridiculous" to assume that the Nicaraguan Sandinistas will negotiate democratic reforms without military pressure from the Contra rebels. Reagan on Wednesday reopened the possibility he will ask Congress to approve new aid for the resistance fighters in the wake of the collapse of peace talks with the Sandinistas. Both Reagan and Secretary of State George P. Shultz hinted strongly that they'll move for more aid, while Contra leaders met with lawmakers on Capitol Hill to press their case.