* Both McCain and Obama favor combating global warming with a "cap and trade" system. Under this plan, the government would set limits on emissions. Companies and others who emit gases below those limits would be able to sell credits to those unable to meet the targets.
* On the future of nuclear power, the candidates are in the same neighborhood. McCain has laid out a plan to build 45 nuclear power plants. Obama has offered more general support, along with the caveat that a nuclear power expansion be coupled with a resolution on how to safely dispose of waste.
* Both have parted ways with Bush and advocated stepped-up negotiations with Russia and other countries to reduce the world's nuclear arsenal.
* Both twice voted for legislation -- which Bush twice vetoed -- that would have eased federal restrictions on human embryonic stem-cell research.
Obama voted in the Senate on Wednesday for a bill, bitterly opposed by many liberals, to expand the government's eavesdropping authority and to protect telephone companies that cooperate with the program from being sued. McCain was not present for the vote but has said he supported the bill.
* Both embrace the idea of continuing Bush's faith-based initiative, a program that funnels federal money to religious charities for social services.