Final answer:
Barack Obama believed tests should foster learning and reflect necessary 21st-century skills, while George W. Bush emphasized their use for accountability and early diagnosis of educational issues.
Step-by-step explanation:
Presidents Barack Obama and George W. Bush both had distinct perspectives on the role of standardized testing in American schools. Obama's view, as reflected in his speech, is that tests should enhance learning and be aligned with 21st century skills such as research and problem-solving. In contrast, Bush's emphasis in the No Child Left Behind Act was on using testing as a diagnostic tool to identify educational deficiencies early on and to ensure all schools succeed by meeting federal standards. This policy has been criticized for leading to 'teaching to the test,' where education is overly focused on test preparation at the expense of broader learning goals. Obama sought to shift from this by advocating for tests that support actual learning, not just accountability.