Unlike an opinion poll, which asks for whom the voter plans to vote, or some similar formulation, an exit poll asks for whom the voter actually voted.
(32- or 64-bit operations are supported equally or better in modern microprocessors.) 65536 is the maximum number of spreadsheet rows supported by Excel 97, Excel 2000, Excel 2002 and Excel 2003.Text files that are larger than 65536 rows cannot be imported to these versions of Excel. (Excel 2007, 2010 and 2013 support 1,048,576 rows (220)).
This number of rows can be saved in the default format that version of Excel supports (e.g. XLSX). However, you will not necessarily be able to save in the older XLS format, which is still limited to 65,536 rows. Typing in a cell in row number 1048576 (e.g. A1048576) then saving to XLS format will cause a warning.