P215 CEEFAX 215 Mon 3 Nov 21:15/23     ]  President Reagan has hit the campaign trail in a last-ditch effort to retain Republican control of the US Senate. After speaking on behalf of his party's candidates in California and Nevada, hj returns to +ashington tomorrow to await the mid-term election results. The outcome is considered vital for the last two years of his presidency because a Senate controlled bz the opposition Democratic party could reduce him to a lame-duck president. The Democrats need a net gain of four seats to take control. News index 102/202 Newsreel 119/219