ST. LOUIS (AP) -- Democratic presidential candidate Barack Obama appears to have a slight lead over Republican John McCain in a poll of likely Missouri voters.

Obama received the support of 48 percent of those polled, compared with 43 percent for McCain and 9 percent who were undecided.

The telephone poll of 800 likely voters was conducted last week by Research 2000 for the St. Louis Post-Dispatch and television station KMOV. It has a margin of error of plus or minus 3.5 percentage points.

A majority of those polled said they trust Obama more on such issues as the economy, energy policy, health care and the environment. More people said they trusted McCain to handle the U.S. effort against terrorism.

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Information from: St. Louis Post-Dispatch, http://www.stltoday.com