As part of a new program designed to encourage reading, President Barack Obama visited a kindergarten class Monday to read the schoolchildren a 200-page memorandum on health care reform. 'All right, part one, subsection A,' the president began as the assembled students fidgeted on their carpet squares. 'Can everyone see this diagram here on page two showing projected excise taxes on high-cost insurance over a 10-year period?' Sources said several of the children, while supporting the plan in principle, remained unsure how the tax base would be able to support the full scope of Obama's proposed measure. 